Immobilization of lead in solid residues from reclaiming metals

Details Immobilization of lead in solid residues from reclaiming metals Immobilization of lead in solid residues from reclaiming metals

A - Human Necessities

62

D

A62D 3/36 (2007.01) B09B 3/00 (2006.01) C22B 3/06 (2006.01) C22B 7/00 (2006.01) A62D 3/00 (2006.01)

Patent

CA 2106600

Solid residues arising from the reclamation of metal from, for example, insulated wires and automobiles, have lead (Pb) sufficiently insolubilized to pass the EPA toxicity test. Addition of water soluble phosphate, especially phosphoric acid, increases the immobilization of lead (Pb) so as to make such residues in compliance with the toxicity tests over a substantially broader pH range, particularly with respect to the more stringent TCLP extraction test.

Le plomb (Pb) contenu dans les résidus solides du recyclage de métal provenant de fils métalliques isolés et d'automobiles, par exemple, est suffisamment insolubilisé pour satisfaire à l'essai de toxicité effectué par l'Agence de Protection de l'Environnement (aux Etats-Unis). L'adjonction de phosphate soluble dans l'eau, notamment d'acide phosphorique, augmente la fixation de plomb (Pb), de sorte que ces résidus satisfont aux essais de toxicité dans une plage de pH sensiblement plus étendue, notamment à l'essai plus sévère d'extraction par lixiviation des composants toxiques.

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